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    • 4. 发明授权
    • Methods for running a high density plasma etcher to achieve reduced transistor device damage
    • 运行高密度等离子体蚀刻机以减少晶体管器件损坏的方法
    • US06255221B1
    • 2001-07-03
    • US09215020
    • 1998-12-17
    • Eric A. HudsonJaroslaw W. WinniczekJoel M. CookHelen L. Maynard
    • Eric A. HudsonJaroslaw W. WinniczekJoel M. CookHelen L. Maynard
    • H01L2102
    • H01L21/31116Y10S438/91
    • Disclosed are methods and systems for etching dielectric layers in a high density plasma etcher. A method includes providing a wafer having a photoresist mask over a dielectric layer in order to define at least one contact via hole or open area that is electrically interconnected down to the silicon substrate of the wafer. The method then proceeds to inserting the wafer into the high density plasma etcher and pulsed application a TCP power source of the high density plasma etcher. The pulsed application includes ascertaining a desired etch performance characteristic, which includes photoresist selectivity and etch rate which is associated with a continuous wave application of the TCP source. Then, selecting a duty cycle of the pulsed application of the TCP source and scaling a peak power of the pulsed application of the TCP source in order to match a cycle-averaged power that would be delivered by the continuous wave application of the TCP source. The pulsed application of the TCP power source is configured to etch through the dielectric layer to at least one contact via hole or open area while substantially reducing damage to the transistor gate oxides of the transistor devices.
    • 公开了用于在高密度等离子体蚀刻器中蚀刻电介质层的方法和系统。 一种方法包括在电介质层上提供具有光致抗蚀剂掩模的晶片,以便限定至少一个电连接到晶片的硅衬底的接触通孔或开放区域。 然后,该方法进行将晶片插入高密度等离子体蚀刻器中,并脉冲施加高密度等离子体蚀刻器的TCP电源。 脉冲应用包括确定期望的蚀刻性能特性,其包括与TCP源的连续波应用相关联的光致抗蚀剂选择性和蚀刻速率。 然后,选择TCP源的脉冲应用的占空比,并且缩放TCP源的脉冲应用的峰值功率,以便匹配由TCP源的连续波应用传递的周期平均功率。 TCP电源的脉冲施加被配置为通过介电层蚀刻到至少一个接触通孔或开放区域,同时基本上减少对晶体管器件的晶体管栅极氧化物的损害。